Mechanical movement



May 25 1926.

B. M. WALKER MECHAN fCAL' MOVEMENT Filed Oct. 16 1925 INVENTOR.

BRUCE mmnukan ATTORNEYS.

Patented -May 25, 1926.

UNITED STATES PATENT orrler imucn M. WALKER, or OAKLAND, CALIFORNIA.

MECHANICAL MOVEMENT.

Application filed October" 16, 1925. Serial No. 62.841.

to in'iprovenm ts in and has particular changing the stroke Thisinvention relates mechanical movements reference to means for of aconnecting rod or pitman without stopping the machinery to which thesame 7 balance ol' the machinery.

A further object is to provide simple means for the controlling of thedevice.

(Other objects and advantages \villbe apparent during the course of thefollowing description.

In the accompanying drawings forming a part of this specification and inwhich like numerals are employed to designate like parts throughout thesame,

a do elevation of my device Figure I is the jack wheel of a. well asapplied to drilling rig, v

Figurell is afragmentary side elevation of my device,

is a top plan view thereol,

Figure Ill Figure IV is a fragmentary cross scctional view of the geararrangement, and

Figure V is a cross-sectional view showing the sliding block carryingthe pin there on. i

it is often zulvautageous to change the stroke in a piece of machii'ierywithout stopping the machinery. At the present time in the drilling ofoil wells it is necessary to stop the drilling apparatus in order tomove .the pin to which the connecting rod is attached farther from thebar so as to give a longer stroke. This stopping delays the drillingaction and istherei'ore expensive. There are some instances where it isnecessary to have a slow" pumping operation while another pump isoperated at high speed, and it is to accommodate for these variancesthat 1 have provided my present invention.

In the accompanying drawings wherein for the purpose of illustration isshown a preferred embodiment of my invention, the numeral 5 refers toajack wheel or fly Wheel -eommonly employed in oilwell drillingoperations, which wheel is secu'r zli on a shaft 6 mounted in suitablebearings 7 and 8 carried upon standards 9 and ll, respectively. Thisconstriietion is common to all drilling operations.

it is customary to provide a crank which is keyed to the shalt (3 and toprovide a plurality of holes in the crank into which the wrist pin to belater on described may be successively placed.

Instead of this construction, I propose to attach to the shat't 6 by akey 12, a block 13 which has chaml'ered edges l-l and 16. This blockcarries a head 17 through which shafts 15 and 19 project. andextend-parallel to the portion of the block. These shafts are eachprovided with a gear as shown at 21 and 22, respectively, over which achain 23 passes. This chain is also rceved over a gear Qtsecurcd to ashaft- 26 also passing through the head 17 and carrying a bevel gear 27upon its lower extremity.

This bevel gear 27 in turn meshes with gears and 29. liy referring toFigure 1V, it will be noted that the gear 28 is provided with anelongated hub 31. while the gear 29 is provided with a short hub 32 andthat the gear 25) and its hub rotate upon the hub 31 of the gear 28. Abrake band 33 is adapted to engage the hub 32, while a brake band 34 isadapted to engage the hub 31. These brake hands are operated by controlrods 36 and 37, respectively, and may be actuated from anyeonvenient'remote point. liy re lcrring to Figures l and ll, it will benoted that the shafts 18 and 19 are screw-threaded and pass through ablock which block is slidablc upon the block 13. This blot-k carries awrist pin 39 to which the coi'ineetiug rod ll is attached.

The result of this construction is that by manipulation of either therod 36 or 37, the block 38 may be caused to move toward or away l'rmnthe axis of rotation as follows:-

Assuming that the rod 36 is actuated so as to contract the brake band33, the gear 29 will be held stationary with the result that the bevelgear 27 will rotate. This rotation will be transmitted through the shaft26, gear 24, through chain 23 which will cause the shafts l8 and 19 torotate and through their serewengagement with the block 38 will causethe same to move upon the block 13, depending upon the direction ofrotation of these screws the shaft 6. By releasing the brake, rotationof the gear will cease and the block will be held securely in the newlyadjusted position. By manipulating the other rod,

i for instance, the rod 37, the band 34 will be stationary.

tightened and the gear 28 will be held This will cause the rotation ofthe parts in a reverse direction, thereby causing the block 38 to, movein a direction opposite to the movement before described.

It will thus be seen that the objects above set forth are accomplishedin a simple and efficient manner.

It is to be understood that the form of my invention herewith shown anddescribed is to be taken as a preferred example of the same and thatvarious changes in the shape, size and arrangement of parts may beresorted to Without departing from the spirit of the invention or thescope of the subjoined claim.

essence Having thus described my invention, I claim 2- In a device ofthe character described, rotating shaft, a block keyed to said shaft,a'sccond block slidably positioned on said first mentioned. block, apair of parallel screws positionedv adjacent the first mentioned blockand passing through said second mentioned block, the upper extremitiesof said screws being rotatably secured Within the head of said firstmentioned block, a gear secured to each of said screws, a chainextending over said gears, a pair of bevel gears rotatably secured onsaid shaft, a third bevel gear meshing with said first mentioned bevelgears, means associated with said last mentioned gear for impartingrotation to said chain, and means for securing said spur gearsindependently against rotation.

In testimony whereof I afiix my signature.

BRUCE M. WALKER.

